Question

solve the following questions (please help)​

Answer 1

REAL IMAGE

An image formed when the light rays converge at a particular point after refraction and reflection is known as a real image.

VIRTUAL IMAGE

An image formed when rays appear to meet a particular point after the reflection from the mirror is known as a virtual image.

Answer 2

Answer:

i) Real image

• Real images are inverted
• Convex lenses form a real image
• Real images are formed on the screen
• Real images are formed by a concave mirror
• Real images are formed due to the actual intersection of light rays.

Virtual image

• Virtual images are erect
• Concave lenses form a virtual image
• Virtual images appear to be on the lens or the mirror itself
• Plane, convex mirror and concave lens form a virtual image
• Virtual images are formed due to the imaginary intersection of light rays

ii)Echo is defined as a sound repeating by sound wave reflection, having a lasting or far reaching impact, or repeating what someone else has said. An example of echo is the repeating of a sound created by footsteps in an empty marble hallway.

For no echo to be produced in a classroom, the classroom should be square shaped with distance between the walls to be less than 17. 2m. Also, the ceiling should be curved shaped so that the reflection of sound wave is uniform throughout the room.

iii)electronic configuration of carbon = 2,4

valency = 4

it will share the electrons...

hope it helps..